NNK-Induced Lung Tumors: A Review of Animal Model.

J Oncol · 2011 · PMC3087887 · PMID 21559252

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The mice receiving 9cRA supplementation had significantly lower tumor multiplicity and showed a trend toward lower tumor incidence, as compared with the mice given NNK alone [ 53 ].

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.